Article: Adobe sends DMCA notice over tweet about Acrobat READER 1.0
Erik on IRC shared this article earlier: https://torrentfreak.com/adobe-goes-after-27-year-old-pirated-copy-of-acrobat-reader-1-0-for-ms-dos-210315/
Adobe regularly sends takedown notices targeting pirated copies of its flagship software products but the company doesn't limit itself to newer releases. F-Secure researcher Mikko Hyppönen has had one of his tweets taken down because it linked to an 'unauthorized' copy of a 27-year-old release of Acrobat Reader 1.0 for MS-DOS.
I'm betting the notice was automated. It's interesting that the original tweet is still up, which links to here.
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(Note: clarified your title, this is regrading READER, of which most versions were FREE)